<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Login</title>
</head>
<body>
<form action="login" method="post">
    <span>用户名</span><input type="text" name="username" /> <br>
    <span>密码</span><input type="password" name="password" /> <br>
    <input type="submit" value="登录">
</form>
</body>
</html>